RESTful Java Client Using HttpClient
Keywords : CXF REST Java Client Using HttpClient, CXF REST HttpClient Example, CXF RESTful Client With HttpClient ,
February 26, 2012
admin
RESTful Java Client Using HttpClient Example explains step by step details of How to create a RESTful java client using Apache HttpClient With Apache CXF
For Creating RESTful Java Client, We are using Apache HttpClient, which will call java.net.HttpURLConnection internally
Here we showing an example, of how to invoking GET and POST method of an exposed restful service (ie; GET & POST operations) .
You can also find CXF Restful Client if you need to call restful service without using Apache HttpClient or any third party libraries
You can see the below example, which is demonstrating a CXF REST Java Client Using HttpClient
Tools Needed For This Tutorial
You need to download
Following jar must be in classpath
- commons-logging-1.1.1.jar
- httpcore-4.2.1.jar
- httpclient-4.2.1.jar
For publishing a restful service, you can follow this tutorial CXF Restful Tutorial. This restful client is based on mentioned Tutorial
POST method using HttpClient (Restful Client)
Here we showing an example of a CXF Restful client, which invoking a POST method of a CXF Restful Service
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
// Invoke POST Method Using HttpClient
public class HttpClientPostExample {
public static void main(String[] args) {
try {
DefaultHttpClient defaultHttpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(
"http://localhost:8080/CXFRestfulTutorial/rest/changeName");
StringEntity inputEntity = new StringEntity(
"{\"Student\":{\"name\":\"Tom\"}}");
inputEntity.setContentType("application/json");
httpPost.setEntity(inputEntity);
HttpResponse httpResponse = defaultHttpClient.execute(httpPost);
if (httpResponse.getStatusLine().getStatusCode() != 200) {
System.out.println("Failed response"
+ httpResponse.getStatusLine().getStatusCode());
}
String output;
System.out.println("Output from Server .... \n");
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(
(httpResponse.getEntity().getContent())));
while ((output = bufferedReader.readLine()) != null) {
System.out.println(output);
}
defaultHttpClient.getConnectionManager().shutdown();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Output from Server ....
{"Student":{"name":"HELLO Tom"}}
GET method using HttpClient (Restful Client)
Here we showing an example of a CXF Restful client, which invoking a GET method of a CXF Restful Service
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
// Invoke GET Method Using HttpClient
public class HttpClientGetExample {
public static void main(String[] args) {
try {
DefaultHttpClient defaultHttpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet("http://localhost:8080/CXFRestfulTutorial/rest/getName");
httpGet.addHeader("accept", "application/json");
HttpResponse httpResponse = defaultHttpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() != 200) {
System.out.println("Failed response"
+ httpResponse.getStatusLine().getStatusCode());
}
String output;
System.out.println("Output from Server .... \n");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(
(httpResponse.getEntity().getContent())));
while ((output = bufferedReader.readLine()) != null) {
System.out.println(output);
}
defaultHttpClient.getConnectionManager().shutdown();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Output from Server ....
{"Student":{"name":"Rockey"}}
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